Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Total revenue	$ 21,192	$ 25,213
Cost of revenue:
Total cost of revenue	8,426	8,558
Gross profit	12,766	16,655
Operating expenses:
Sales and marketing	19,140	16,636
Research, development and engineering	15,971	15,435
General and administrative	9,897	9,680
Intellectual property	1,282	1,469
Total operating expenses	46,290	43,220
Operating loss	(33,524)	(26,565)
Other income, net	1,057	588
Loss before income taxes	(32,467)	(25,977)
Benefit (provision) for income taxes	(39)	206
Net loss	$ (32,506)	$ (25,771)
Earnings (loss) per common share:
Loss per common share — basic	$ (2.86)	$ (2.44)
Loss per common share — diluted	$ (2.86)	$ (2.44)
Weighted average common shares outstanding — basic	11,360	10,571
Weighted average common shares outstanding — diluted	11,360	10,571
Service [Member]
Revenue:
Total revenue	$ 12,774	$ 12,936
Cost of revenue:
Total cost of revenue	5,922	5,792
Subscription [Member]
Revenue:
Total revenue	6,041	5,519
Cost of revenue:
Total cost of revenue	1,907	2,264
License [Member]
Revenue:
Total revenue	2,377	6,758
Cost of revenue:
Total cost of revenue	$ 597	$ 502